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The amazing changes intermittent fasting does to your body and brain.
Stars like Beyonce and Hugh Jackman have spoken out about following intermittent fasting plans to get in shape. How does intermittent fasting work? Here's what actually happens to your body and brain when you fast. Following is a transcript of the video.

How long has it been since you last ate? People who fast intermittently often eat within an 8-hour block, leaving 16 hours of fasting in between. During that 16-hour stretch, their bodies undergo an important change that sets them apart from non-fasters.

Here's how it works.

When you eat, you store some of that energy in the liver as glycogen. But after 10-12 hours of not eating, your glycogen reserves will be extremely low. As a result, you may feel more irritable than normal, a term scientists call "hangry."